Patents by Inventor Theodore J. Crona

Theodore J. Crona has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Substrate for a lithographic printing plate
    Patent number: 4802935
    Abstract: A substrate for a lithographic printing plate is made of a rolled aluminum alloy sheet of following composition: 0.8 to 2.0% Fe, up to 0.8% Si and up to 1.0% Mn, such that the sum of the Si and Mn contents lies between 0.3 and 1.3%, up to 0.3% Cu, up to 0.8% Mg, up to 2.0% Zn and 0.3% each of other constituents in total up to 1.0%, rest aluminum. A process for manufacturing such a substrate is such that this composition is cast as a 5 to 12 mm thick strip then fabricated to a 0.03 to 0.6 mm thick rolled sheet.
    Type: Grant
    Filed: December 29, 1987
    Date of Patent: February 7, 1989
    Assignee: Swiss Aluminium Ltd.
    Inventors: Theodore J. Crona, Heinz Bichsel, Jurgen Timm
  • Process for manufacturing a substrate for a lithographic printing plate
    Patent number: 4800950
    Abstract: A substrate for a lithographic printing plate is made of a rolled aluminum alloy sheet of following composition: 0.8 to 2.0% Fe, up to 0.8% Si and up to 1.0% Mn, such that the sum of the Si and Mn contents lies between 0.3 and 1.3%, up to 0.3% Cu, up to 0.8% Mg, up to 2.0% Zn and 0.3% each of other constituents in total up to 1.0%, rest aluminum. A process for manufacturing such a substrate is such that this composition is cast as a 5 to 12 mm thick strip then fabricated to a 0.03 to 0.6 mm thick rolled sheet.
    Type: Grant
    Filed: December 29, 1987
    Date of Patent: January 31, 1989
    Assignee: Swiss Aluminium Ltd.
    Inventors: Theodore J. Crona, Heinz Bichsel, Jurgen Timm